Sizzling heat is not shown in the chart at left. The metal stiffens as it cools down and cannot be worked as easily when it cools to lower temperatures. A good rule of thumb for most shaping of mild steel and wrought iron is to work it when heated yellow, and put it back in the fire when it cools to red.
UIO redirects here. For other uses, see UIO (disambiguation). Mariscal Sucre International Airport (Spanish: Aeropuerto Internacional Mariscal Sucre) (IATA: UIO, ICAO: SEQM) is the busiest airport in Ecuador and one of the busiest airports in South America.
YHZ is the IATA code for the airport, CYHZ is the ICAO code. YOW is the IATA code for the airport, CYOW is the ICAO code. YQB is the IATA code for the airport, CYQB is the ICAO code. YUL is the IATA code for the airport, CYUL is the ICAO code. YVR is the IATA code for the airport, CYVR is the ICAO code. YWG is the IATA code for the airport, CYWG is the ICAO code. YXU is the IATA code for the airport, CYXU is the ICAO code.